Machine for sharpening saws.



G. C. HUNTER.

MACHNE FOR SHAHPENING SAV/S.

PPLlcATloN FILED 050.28. 1911,

Patented July 9, 1918.,

SHEETS-SHEETI lu nl" el" 1 l f G. C. HUNTER..

MACHINE FOR SHRPEMNG SAWS.

APPLICATION FILED DEc.28.1917.

l $72,339. Patented July 9, 1918.

4 S EEEEEE SHEET 2.

Il`A`l X IIIIIIIIIII G. C. HUNTER.

MACHINE FOR SHARPENING SAWS.

APPLICATION HLED DEC. 28'1917 l ,27@,339. Patend July 9, i918.

4 SHEETS-SHEET 3.

6. C, HUNTER.-

FVMCHINE FOR SHARPEMNGSAWS APPLscA'noN FILED Dames, w11.

l sfg Patented July 9, i918.

4 SHEETS-SHEET FTCE.

f GEORGE C.,H`UNTER, OF CLEVELAND, OHIO.

MACHINE FOR .SHARPENING- -SAWS Specification of Letters Patent.

Patented July 9,1918.

Application ledeceniber 28, 1917. Serial No. 209,217.

To all whom z5-may concern.:

Be it known thatl.l GEORGE CJHUNTER, citizen ofthe United States, residing at Cleveland, inthe county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Machines for Sharpening Saws, of` which the following is a specification.

This invention relates to a machine for sharpening saws, and has for-'its object -to provide an improved machine adapted-for sharpening saws of variouskinds,.such as band saws, hack saws and circular saws. Machines have heretofore been provided for sharpening single types of saws, but bythe present inventionA saws of various types may be sharpened.

The machine is of that type in which the saw is fedalong, or rotated, intermittently, to present the successive. teeth to the action of a grinding wheel or disk, this disk being mounted on a frame which is'raised and lowered intermittently, in time with the movement of the saw.

A further object of the invention is Vto provide improved means for raising and lowering the grinding disk, and also for adliusting the position or angle thereof, with respect to the work.

A further object of the invention is to provide improvedmeans for varying the saw feed.

A further object of the invention is to provide improved means of stopping the up and down movement/of the-sharpening wheel without throwing off 'the power.

A further object of the invention is to provide improved means for supporting various types of sawsin position fforfthe sharpening' operation.

Other features of Inovelty willbe apparent from theV followingdescription and the accompanying drawings.

In the drawings- Figure 1k isaI perspective view showing the machine arranged'for sharpening a-circular saw.

Fig. 2 is a similarview showing the arrangement for sharpening a hack: or band saw.

I'Fig. 3 isa detaill in perspective of the cam mechanism for lifting the lgrinding disk. v

Fig.`4 isa detail inside elevationshowing the lifting mechanismout of action.

Fig: 4'L1is a d'etailof auniversal-joint.

Fig. vis aperspective view of the machine as seen from the rear.

Fig. 6 isa detail lof a holder for a band or hack saw.

Fig. 7 is a detail in section of part of the lifting devices. Referring specilically to the drawings, F lndicates a frame of l,suitable construction to support the parts to be hereinafter described.Y 1 is a power shaft which extends from the rear of the Amachine under the table or top thereof and carries fast and loose pulleys 2 for the application ofa driving belt. The shaft alsocarries a pulley for driving the emery wheel spindle to be hereinafter described. Upon the inner end of the shaft 1 is a worm 3 which meshes with a worm gear 4 mounted on a cross shaft 5 supported in suitable bearings under the table of the frame. This shaft 5 carries a cam 6 which acts on a roller 7a by a lifting ar1n7 which is pivoted at 8 to the frame. This arm, by a universal joint connection 10, acts to raise andlower a screw'rod' 9, the threaded part 13 of which extends through a long split nut at 12a having a sockfet12b which receives the round head 12 of a pin gate 11. The ball and socket joint permits universal movement. The nut may be held at adjustment on the rod by a clamp screw 12. The slidellisinovable up and down in a slide way or vertical guide bracket 14. The guide way 14 is integral with a rearwardly projecting ring lor cuff 14n which is held in an outer rim 14h, which stands on the frame and is split as indicated at 14C, with a clamp screw 14d to tighten the rim on the cuff. By loosening the clamp, the guide way 14 and cuff 14, as a whole, may be turned to various angles on either side of the vertical,and this adjustment iixes the set or angle of the grind ing disk with respect to thework,since the grinding disk spindle is carried by the slide 11 which is supported in theguide 14. The slide 11 has bearing brackets 15a projecting forwardlyJ therefrom and supportingy the spindle 15 ofthe grinding wheel or disk 16. This spindle has a pulley 17 between- Vthe brackets which is driven by a belt 61 from the pulley-60, the belt passing through openings in the frames 11 andy 14 and over guide pulleys'62 at the rear of the guide ways 14, the arbors of these pulleys being ing on the frame at the back thereof.

By adjusting the screw rod 9 the grinding wheel carrier may be raised or low-ered to vary the position of the wheel with respect to the work, and by the rotation of the cam 6, the arm 7 is lifted and dropped and the emery wheel is intermittently raised and lowered in time with the saw feed. 1

Mounted on the end of thecross-shaft 5 is a face cam 18 which acts against a roller 19 carried by a dependent arm 20 which swings on a rock shaft 21 extending from front to rear at one end of the machine, the shaft being supported by the suitable bearing bracket on the end of the frame. Also loosely mounted on this shaft is an arm 22, projecting upwardly and carrying, by means of a head 22, a pair of feeding fingers or pawls 23 which project in position to engage the teeth of the saw just in advance of the grinding disk. 28 is an arm fast on the rock shaft 21, and depending behind arm 2O and provided with a set screw 27 the end of which rests against the back of the arm 20. A spring 29 connects the arms 28 and 20. 25 is an arm fast on the rock shaft 21 and oiset behind the arm 22, to which it is connected by a spring 26, and a set screw 24 carried by the arm 25 abuts against the arm 22. The head 22n is also provided with a vset screw 24a, for adjustment of the pawls 23 and with respect to the arm 22. v

By means of the arms 20, 28, 22, and 25, and the set screws 24 and 27, motion imparted to the arm 20 by the cam 18 is transmitted to the feeding pawls 23 and the relative amount of throw may be adjusted according to the size or spacing of the teeth of the saw being sharpened, so as to advance the saw a proper distancer at each operation to register the grinding disk therewith. Obviously the cams 6 and 18 will be so timed that the feed of the saw will be produced while the grinding disk is raised from the work.

For work on a hack or band saw, as shown in Fig. 2, I provide a bracket 31 which is bolted as shown at 44 to a slide 30 which is movable up and down in a slide way 30a at the front of the machine and is adjustably supported by a screw 34 operated through bevel gears 35 and 36 by a handle 37. The bracket 3l has a. steel plate 32 at the top upon the upper edge of which the saw rests, and at each end of the plate the bracket has a slotted lug 33 through which the saw passes. When this bracket is used the steel plate projects upwardly between a front guide bar 38 and a rear guide bar 38a extending across the front of the machine under the grinding head. The front bar 38 is supported by a pair of spring arms 39 each of which is fastened to an angle plate 40 pivoted at 41 to the ends of the frame, and

Yheld by removable pins 42. By removing the pins, the bai' 34 may be swung out and down forwardly to release the saw. 43 is a knob on the bar to operate it. The front and rear bars 38and 38, the steel plate 32, and the slotted lugs 33, are all lined to form a guide way through which the saw is fet by the pawls as above described, and this arrange-ment is used for hack or band saws. By means of the handle 37 the bracket can be raised or lowered to properly position saws of different widths.

For grinding circular saws, as shown in Fig. 1, thebracket 31 is removed by taking out the bolts 44. The circular saw C is mounted on an arbor 46 entered through the slot in a hanger 45 depending from the bar 38, the arbor being fastened by a hand nut 47 to clamp the circular saw at the desired elevation to present its teeth to the grinding disk. In this position, by the feeding mechanism described, the circular saw will be turned to present the teeth in succession to the disk, the disk being raised or lowered by the cam 6 as before. In this construction, the saw will swing with the bar 38 when the latter is let down by releasing the catch 42, and this permits the saw to be readily attached or detached. A detent 51 may also be provided to engage the'saw teeth and prevent back slip thereof. This detent. is pivoted at 52 and may be swung back out of Y action when desired, as shown in Fig. 2.

For stopping the operation of the gate a rod 49 is provided, mounted in a support in the frame and provided at its outer end with a hand wheel 50 and at its inner end with a cam 48 located under the lifter 7, and by turning the handle, the lifter may be raised out of contact with the cam 6, as shown in Fig. 4, in which position the up and down movement will cease and the saw may be inspected without stopping the main drive.

The universal joints at l() and 12c permit angular variation of the rod 9 incident to the rise and fall of the gate in the angular guide ways, and the ring support for the guide 14 permits the angle or set of the grinding disk to be varied according to the kind of saw teeth being ground.V

A belt shifter is shown at 53, operated by a handle 54. Y

I claim:

1. The combination with a saw sharpening machine of the type having a guide-way for a straight saw and means to advance the saw along the same, of a removable plate forming part 'of said guide-way, and means to support a circular saw for rotation in the position occupied by said plate, upon removal thereof.

2. In a saw sharpening machine, a guidemeans to support a circular saw between the side bars, upon removal of the bottom plate.

3. In a saw sharpening machine, a guideway comprising two side bars, one ot' which is pivoted to swing toward or from the other, and a bracket attached to the latter side bar and provided with means to clamp a circular saw thereto with its edge between the bars.

4. In a saw sharpening machine, a feed mechanism comprising a rock shaft having two arms loose thereon, two other arms fast on the rock shaft, an adjustable connection between each of the iixed arms and each of the loose arms respectively, cam means to vibrate one of the loose arms, and a saw feeding 'pawl carried by the other loose arm.

5. Means to support a grinding disk spindle for angular adjustment, comprisin a fixed circular rim, a circular member fitting the rim and arranged to turn circumferentially thereon, and means to support the spindle in transverse position across said member, whereby adjustment of said member varies the inclination of the spindle.

(i. In a saw sharpening machine, a guideway comprising two side bars, and a vertically adjustable bracket provided with a bottom plate fitting edgewise between the side bars, to support a saw there between, the bracketalso having slotted lugs at the ends of the side bars, with the slots in line with the guide-way between the bars.

7. In a saw sharpening machine, the oombination with a grinding wheel spindle, of a sliding carrier therefor, an adjustable rod connected to the carrier,` a lifter arm on which the rod rests, and means to vibrate the arm, said means including a cam operating against the arm, and means to lift the arm out of contact with the cam.

8. In a saw sharpening machine, the combination with a frame having upright guides, a carrier slidable up and down in said guides, a grinding wheel spindle supported on said carrier, means to drive the spindle, and means to reciprocate the carrier, said means including a lifter mounted on the trame, and a rod connected to the carrier and to the lifter, the connection to the carrier including an adjusting screw and the connection to the lifter including a universal joint.

9. In a saw sharpening machine, the combination ot' a fixed supporting circular rim, a guide having a circular cuil litting said rim and adjustable angularly thereon, a carrier slidable on the guide, a rotary grindin disk mounted on the carrier, means to drive the disk, and means to reciprocate the carrier.

l0. In a saw sharpening machine, the combination of an outer circular supporting rim, a guide having an annular part lit-ting in the rim and adjustable therein to various angles with respect to the guide, a grinding disk spindle supported on the front of the carrier frame, a driving belt for said spindle, passing from front to back through the carrier frame and the annular part of t-he guide, and means to reciprocate the carrier trame.

ll. Means to support a grinding disk for angular adjustment, comprising a iXed vertical rim, an annular cuff fitting in said rim and provided with guides on one face thereof, the cuff being movable circumferentially :tor angular adjustment in the rim, a carrier slidable in said guides, and a spindle supporting the grinding disk and mounted on the face of said carrier.

l2. Means to support a grinding disk spindle for angular adjustment, comprising two rings one of which is fixed and the other of which is adjustable circumferentially thereon to various angles, and means to support the spindle in transverse position upon the adjustable ring, whereby adjustment of the ring varies the inclination of the spindle.

13. The combination of a iXed ring, an adjustable ring mounted to turn circumferentially therein, a grinding disk spindleeX- tending transversely across one side of the adjustable ring and supported thereon, and a driving belt extending through the rings from the opposite side thereof and engaging the spindle to drive the same.

In testimony whereof, I do affix my signature in presence of two witnesses.

GEORGE C` HUNTER.

Witnesses:

JOHN A. BOMMHARDT, G. W. RosENBERG.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, I). 0. 

